Python 2.7 exceptions.TypeError不可损坏的类型列表。我该如何解决这个问题？

好的，唯一对我不起作用的是视图函数。在我添加一个事件，然后我尝试查看它之后，我得到一个不可破坏的类型：“list”错误。这是为什么？我如何修复它？谢谢

您正在分配

x=dictionary.keys（）

，这意味着x是（字典中所有键的）列表。然后在dictionary中执行

if x，询问键
x
是否是dictionary中的键。但是列表是可变的，所以不允许它是键

你是不是真的想说如果字典里的小时数是多少？
这很有效谢谢！很抱歉我讨厌成为一个有着愚蠢问题的新程序员。
import time

dictionary = {}

def add():
    x = int(raw_input("Please enter the hour of your event in 24 hour time"))  
    y = raw_input("Please enter the name of your activity")  
    dictionary[x] = y  
    print (dictionary[x] + " was added succesfully")  
    main()  

def view():
    theTime = time.localtime()  
    print "the hour is: ", theTime.tm_hour  
    theHour = theTime.tm_hour  
    x = dictionary.keys()  
    if x in dictionary:  
        print "The current event is", x  
    print "Your full shcedule for today is: ", dictionary  
    main()

def remove():
    print dictionary  
    x = int(raw_input("which time slot would you like to clear?"))  
    z = dictionary.pop(x)  
    print z + " was removed"  
    main()  

table = {
    1 : add,
    2 : view,
    3 : remove
    }

def run(x):
    table[x]()

def main():
    x = int(raw_input("Please select and option! \n\n1. Add an event \
\n2. View an event \n3. Remove an event \n4. Exit"))  
    if x == 4:  
        exit()  
    run(x)  

main()